S-97345A665 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments due to 316 stainless steel construction, ideal for chemical, marine, and outdoor applications.
• Exceptional mechanical strength with a tensile strength of 70,000 psi and shear strength of 35,000 psi, ensuring reliable performance under heavy loads.
• Precise alignment and smooth rotation enabled by the 1 1/8" shoulder length with tight tolerances, reducing wear in pivoting and guiding assemblies.
• Secure and durable fastening with a Class 3A thread fit and 1/4"-20 UNC coarse threads, providing excellent vibration resistance and easy installation.
• Easy installation and removal using a standard 3/16" hex drive and knurled head for enhanced grip, even in confined spaces or with gloved hands.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.
• Long-lasting durability supported by Rockwell B79 hardness, maintaining integrity in high-stress and repetitive motion applications.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common industrial challenges, such as misalignment, corrosion, and mechanical failure. The 1/4"-20 UNC coarse thread and Class 3A fit ensure a tight, vibration-resistant connection, crucial for machinery and equipment subjected to dynamic loads. The 1 1/8" shoulder length with precise tolerances provides a stable bearing surface, reducing friction and wear in rotating assemblies like pivots, linkages, and guides. Made from corrosion-resistant 316 stainless steel, it excels in demanding environments, including chemical processing, marine, and food-grade applications, while the hex drive and knurled head facilitate quick maintenance. Ideal for precision engineering and heavy-duty industrial use, this screw enhances reliability and extends service life in critical systems.

Specification Summary & Compliance

This shoulder screw adheres to strict dimensional standards, including a Class 3A thread fit for high precision and UNC coarse threads per ASME specifications. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring consistent performance. It meets ASME B18.3 for design and manufacturing, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for global industrial applications.